docs: fix CONTRIBUTING first-run path and rustapi-rs crates.io README

[Tuntii]

Fixes the two Show HN docs blockers: a dead first-run path in CONTRIBUTING, and a mixed-language / stale-version Quick Start on the crate README that crates.io publishes.

Description

A first-time contributor following CONTRIBUTING.md was told to ls examples/ and cargo run -p hello-world. Those workspace packages are gone. The live path is crates/rustapi-rs/examples/ and cargo run -p rustapi-rs --example golden_path (same command as docs/GOLDEN_PATH.md).

crates/rustapi-rs/README.md is what crates.io shows for rustapi-rs 0.2.0. The Quick Start mixed leftover Turkish copy with English and still had a version = "0.1" + features = ["full"] snippet next to the 0.2.0 path. That section is now one English 0.2.0 install (crate name + optional api alias), matching docs/GETTING_STARTED.md. The rest of the crate README is unchanged.

No code or feature changes.

Type of Change

• Documentation update

Related Issues

Fixes #258, Fixes #259

Testing

• ls crates/rustapi-rs/examples/ lists golden_path.rs (and the other in-crate examples)
• cargo run -p rustapi-rs --example golden_path builds and serves
• GET /api/v1/ping → {"status":"ok"}
• GET /live → healthy probe JSON
• GET /docs/openapi.json returns a spec
• crates/rustapi-rs/README.md Quick Start is English-only, pins 0.2.0, and has no Turkish leftover / 0.1 + full snippet

Additional Notes

The stale CONTRIBUTING paths were leftover from when examples were workspace member crates under a root examples/ directory, not from a pre-workspace layout. The project-structure tree now matches current crates/ (rustapi-mcp, rustapi-grpc, rustapi-testing) and drops the old root examples/, benches/, and memories/ entries.